Master Gardener Certification Exam Study Guide – 150
Practice Questions & Answers (2026 Edition) |
INSTANT PDF DOWNLOAD
Batch 1: Botany, Soils, and Nutrient Management
1. Which part of the plant is primarily responsible for the process of transpiration?
A) Xylem
B) Stomata
C) Phloem
D) Cambium
Rationale: Stomata are the small openings on the leaf surface that regulate gas
exchange and water vapor loss.
2. A fertilizer bag is labeled 10-20-10. What does the middle number represent?
A) Nitrogen
B) Potassium
C) Phosphorus
D) Calcium
Rationale: N-P-K stands for Nitrogen, Phosphorus, and Potassium in that specific
order.
3. If a soil test reveals a pH of 5.5, the soil is considered:
A) Acidic
B) Alkaline
C) Neutral
D) Saline
Rationale: 7.0 is neutral; anything lower is acidic, anything higher is alkaline.
4. Which plant tissue acts as the "elevator" that moves water and minerals upward from
the roots?
A) Xylem
B) Phloem
C) Epidermis
D) Pith
Rationale: Xylem transports water up; Phloem transports sugars (food) down.
,5. What is the most effective way to lower the pH of an alkaline soil?
A) Adding Lime
B) Adding Elemental Sulfur
C) Adding Wood Ash
D) Adding Bone Meal
Rationale: Sulfur acidifies the soil, whereas lime and wood ash raise the pH.
6. A plant that completes its life cycle in two growing seasons is called a(n):
A) Annual
B) Biennial
C) Perennial
D) Ephemeral
Rationale: Biennials grow foliage the first year, then flower and die the second year.
7. Which nutrient is most responsible for lush, green vegetative growth?
A) Nitrogen
B) Phosphorus
C) Magnesium
D) Iron
Rationale: Nitrogen is the primary component of chlorophyll and vital for leaf
development.
8. "Damping off" is a common problem for seedlings caused by:
A) Lack of sunlight
B) Soil-borne fungi
C) Over-fertilization
D) Aphids
Rationale: Fungal pathogens thrive in cool, wet soil and kill young seedlings at the soil
line.
9. Which of the following is an example of a monocot?
A) Oak Tree
B) Corn
C) Tomato
D) Rose
Rationale: Monocots have parallel leaf veins and one cotyledon; grasses and corn are
classic examples.
10. What does "CEC" stand for in soil science?
A) Cation Exchange Capacity
B) Carbon Energy Cycle
, C) Calcium Enrichment Compound
D) Controlled Environment Cultivation
Rationale: CEC measures the soil's ability to hold onto essential nutrients.
11. Phototropism is the tendency of a plant to:
A) Bloom only at night
B) Grow toward a light source
C) Shed its leaves in autumn
D) Close its flowers when touched
Rationale: Auxins cause cells on the shaded side to elongate, bending the plant toward
light.
12. Which soil texture has the highest water-holding capacity?
A) Sand
B) Silt
C) Clay
D) Loam
Rationale: Clay particles are the smallest and have the most surface area to hold
water.
13. The point on a stem where a leaf or bud is attached is called a:
A) Node
B) Internode
C) Stipule
D) Petiole
Rationale: The node is the active growth point for leaves and branches.
14. Which of these is a secondary macronutrient?
A) Potassium
B) Magnesium
C) Boron
D) Copper
Rationale: Secondary macronutrients include Calcium, Magnesium, and Sulfur.
15. What happens when you over-apply lime to a garden?
A) The soil becomes too acidic.
B) Micronutrients like Iron can become "locked up" and unavailable.
C) The plant grows too much foliage.
D) The soil becomes hydrophobic.
Rationale: High pH (alkalinity) prevents plants from absorbing metallic micronutrients.
Practice Questions & Answers (2026 Edition) |
INSTANT PDF DOWNLOAD
Batch 1: Botany, Soils, and Nutrient Management
1. Which part of the plant is primarily responsible for the process of transpiration?
A) Xylem
B) Stomata
C) Phloem
D) Cambium
Rationale: Stomata are the small openings on the leaf surface that regulate gas
exchange and water vapor loss.
2. A fertilizer bag is labeled 10-20-10. What does the middle number represent?
A) Nitrogen
B) Potassium
C) Phosphorus
D) Calcium
Rationale: N-P-K stands for Nitrogen, Phosphorus, and Potassium in that specific
order.
3. If a soil test reveals a pH of 5.5, the soil is considered:
A) Acidic
B) Alkaline
C) Neutral
D) Saline
Rationale: 7.0 is neutral; anything lower is acidic, anything higher is alkaline.
4. Which plant tissue acts as the "elevator" that moves water and minerals upward from
the roots?
A) Xylem
B) Phloem
C) Epidermis
D) Pith
Rationale: Xylem transports water up; Phloem transports sugars (food) down.
,5. What is the most effective way to lower the pH of an alkaline soil?
A) Adding Lime
B) Adding Elemental Sulfur
C) Adding Wood Ash
D) Adding Bone Meal
Rationale: Sulfur acidifies the soil, whereas lime and wood ash raise the pH.
6. A plant that completes its life cycle in two growing seasons is called a(n):
A) Annual
B) Biennial
C) Perennial
D) Ephemeral
Rationale: Biennials grow foliage the first year, then flower and die the second year.
7. Which nutrient is most responsible for lush, green vegetative growth?
A) Nitrogen
B) Phosphorus
C) Magnesium
D) Iron
Rationale: Nitrogen is the primary component of chlorophyll and vital for leaf
development.
8. "Damping off" is a common problem for seedlings caused by:
A) Lack of sunlight
B) Soil-borne fungi
C) Over-fertilization
D) Aphids
Rationale: Fungal pathogens thrive in cool, wet soil and kill young seedlings at the soil
line.
9. Which of the following is an example of a monocot?
A) Oak Tree
B) Corn
C) Tomato
D) Rose
Rationale: Monocots have parallel leaf veins and one cotyledon; grasses and corn are
classic examples.
10. What does "CEC" stand for in soil science?
A) Cation Exchange Capacity
B) Carbon Energy Cycle
, C) Calcium Enrichment Compound
D) Controlled Environment Cultivation
Rationale: CEC measures the soil's ability to hold onto essential nutrients.
11. Phototropism is the tendency of a plant to:
A) Bloom only at night
B) Grow toward a light source
C) Shed its leaves in autumn
D) Close its flowers when touched
Rationale: Auxins cause cells on the shaded side to elongate, bending the plant toward
light.
12. Which soil texture has the highest water-holding capacity?
A) Sand
B) Silt
C) Clay
D) Loam
Rationale: Clay particles are the smallest and have the most surface area to hold
water.
13. The point on a stem where a leaf or bud is attached is called a:
A) Node
B) Internode
C) Stipule
D) Petiole
Rationale: The node is the active growth point for leaves and branches.
14. Which of these is a secondary macronutrient?
A) Potassium
B) Magnesium
C) Boron
D) Copper
Rationale: Secondary macronutrients include Calcium, Magnesium, and Sulfur.
15. What happens when you over-apply lime to a garden?
A) The soil becomes too acidic.
B) Micronutrients like Iron can become "locked up" and unavailable.
C) The plant grows too much foliage.
D) The soil becomes hydrophobic.
Rationale: High pH (alkalinity) prevents plants from absorbing metallic micronutrients.
